The Central Andean Altiplano‐Puna magma body

1999/03/15 by Josef Chmielowski, G. Zandt, Christian Haberland · 202 citations
Earth and Planetary Sciences · #Geological and Geochemical Analysis #earthquake and tectonic studies #High-pressure geophysics and materials #Geology #Sill #Magma #Volcano #Seismology #Igneous rock #Receiver function #Magma chamber #Amplitude #Petrology #Geochemistry #Tectonics

paper · pdf · doi:10.1029/1999gl900078

published in Geophysical Research Letters 26(6), 783-786 (American Geophysical Union)

openalex publication_date 1999/03/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/26

Abstract

Receiver function analysis of 14 teleseismic events recorded by 6 temporary PASSCAL broadband stations within the Altiplano‐Puna volcanic complex (APVC) shows a consistent ∼2 s negative‐polarity P ‐to‐ S conversion for all stations for all available azimuths. Forward modeling of the largest amplitudes suggests that this conversion is produced by the top of a very low velocity zone at a depth of ∼19 km, with a Vs <0.5 km/s and a thickness of 750–810 m. We interpret the characteristics of the low‐velocity zone (low Vs , areal extent, and flatness) to be consistent with a sill‐like magma body. On the basis of additional data from the German ANCORP experiment, the Altiplano‐Puna magma body appears to underlie much of the APVC, and it may therefore be the largest known active continental crustal magma body.

Citations

• THE EVOLUTION OF THE ALTIPLANO-PUNA PLATEAU OF THE CENTRAL ANDES

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• Galán [wikipedia]
• Purico complex [wikipedia]